Route Reliability
Buffalo → Denver
BUF–DEN · 1,359 miles · Buffalo Niagara International Airport to Denver International Airport
- 81%
- Arrive within 15 minutes
- 5 min
- Average arrival delay
- 0.3%
- Cancelled
- 614
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.United Airlines86%293 flights
- 2.Southwest Airlines80%262 flights
Not enough history to rank: Frontier Airlines (59 flights). We rank airlines only after 100 flights on the route.
What the data says
Morning-you made the right choice.
BUF–DEN flights departing between 3–6 AM arrived on time 89% of the time, versus 55% between 3–6 PM.
Wednesdays have been rough.
BUF–DEN flights arrived on time 94% of the time on Thursdays and just 77% on Wednesdays. That gap is worth planning around.
United Airlines has a slight edge here.
United Airlines arrived on time 86% of the time on this route; Southwest Airlines managed 80%.
It basically never cancels.
Out of 614 scheduled flights, only 0.3% were cancelled.
Flights on this route
The breakdown
- Mon78%(96 flights)
- Tue79%(67 flights)
- Wed77%(73 flights)
- Thu94%(72 flights)
- Fri79%(97 flights)
- Sat77%(110 flights)
- Sun85%(96 flights)
- 3–6 AM89%(45 flights)
- 6–9 AM87%(362 flights)
- 9 AM–12 PM80%(65 flights)
- 12–3 PM86%(43 flights)
- 3–6 PM55%(91 flights)
- 6–9 PM—(5 flights)
Jun 91% → May 81% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 91% | 77 |
| July 2025 | 82% | 83 |
| August 2025 | 82% | 81 |
| September 2025 | 77% | 77 |
| October 2025 | 87% | 70 |
| November 2025 | 81% | 52 |
| December 2025 | 68% | 19 |
| January 2026 | 64% | 14 |
| February 2026 | 72% | 36 |
| March 2026 | 76% | 33 |
| April 2026 | 85% | 33 |
| May 2026 | 81% | 36 |
Keep nerding
Based on 614 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.